Download Button with Progress
Click to download: the button darkens into a track, fills left to right while the percentage counts up and the arrow bobs, then shows a check. The number is a registered @property integer.
Also known as: download button animation css, download progress button, css button progress bar.
HTML
<label class="btn-download-progress">
<input class="btn-download-progress-input" type="checkbox" aria-label="Download">
<span class="btn-download-progress-face" aria-hidden="true">
<span class="btn-download-progress-fill"></span>
<svg class="btn-download-progress-icon" viewBox="0 0 24 24">
<path class="btn-download-progress-arrow" d="M12 3.5v11M7 10l5 5 5-5"/>
<path class="btn-download-progress-check" d="M6.5 10.5l3.8 3.8L17.5 7"/>
<path d="M4.5 20h15"/>
</svg>
<span class="btn-download-progress-text">
<span class="btn-download-progress-idle">Download</span>
<span class="btn-download-progress-busy"></span>
<span class="btn-download-progress-done">Saved</span>
</span>
</span>
</label>CSS
@property --btn-download-progress-p {
syntax: "<integer>";
inherits: false;
initial-value: 0;
}
.btn-download-progress {
--c: var(--btn-color, #3b82f6);
position: relative;
display: inline-grid;
place-items: center;
font: 600 var(--btn-size, 18px)/1.1 system-ui, sans-serif;
cursor: pointer;
user-select: none;
-webkit-tap-highlight-color: transparent;
}
.btn-download-progress-input {
position: absolute;
inset: 0;
z-index: 1;
width: 100%;
height: 100%;
margin: 0;
opacity: 0;
cursor: pointer;
}
.btn-download-progress-face {
position: relative;
isolation: isolate;
overflow: hidden;
display: inline-flex;
align-items: center;
gap: 0.6em;
width: 9.4em;
box-sizing: border-box;
padding: 0.8em 1.25em;
border-radius: 0.7em;
background-color: var(--c);
color: #fff;
transition: background-color 0.3s ease, transform 0.2s ease;
}
.btn-download-progress-fill {
position: absolute;
inset: 0;
z-index: -1;
background: var(--c);
transform: scaleX(0);
transform-origin: left;
}
.btn-download-progress-icon {
flex: none;
width: 1.25em;
height: 1.25em;
fill: none;
stroke: currentColor;
stroke-width: 2.4;
stroke-linecap: round;
stroke-linejoin: round;
overflow: visible;
}
.btn-download-progress-check {
stroke-dasharray: 17;
stroke-dashoffset: 17;
}
.btn-download-progress-text {
display: grid;
flex: 1;
justify-items: center;
}
.btn-download-progress-text > span { grid-area: 1 / 1; }
.btn-download-progress-busy,
.btn-download-progress-done { opacity: 0; }
.btn-download-progress-busy {
counter-reset: btn-download-progress-n var(--btn-download-progress-p);
font-variant-numeric: tabular-nums;
}
.btn-download-progress-busy::after { content: counter(btn-download-progress-n) "%"; }
.btn-download-progress:active .btn-download-progress-face { transform: scale(0.96); }
.btn-download-progress-input:focus-visible ~ .btn-download-progress-face {
outline: 2px solid var(--c);
outline-offset: 0.2em;
}
.btn-download-progress-input:checked ~ .btn-download-progress-face {
background-color: color-mix(in srgb, var(--c) 35%, #0b1120);
}
.btn-download-progress-input:checked ~ .btn-download-progress-face .btn-download-progress-fill {
animation: btn-download-progress-fill 2.4s linear forwards;
}
.btn-download-progress-input:checked ~ .btn-download-progress-face .btn-download-progress-busy {
animation:
btn-download-progress-count 2.4s linear forwards,
btn-download-progress-busy 2.6s ease forwards;
}
.btn-download-progress-input:checked ~ .btn-download-progress-face .btn-download-progress-idle {
animation: btn-download-progress-out 0.15s ease-in forwards;
}
.btn-download-progress-input:checked ~ .btn-download-progress-face .btn-download-progress-done {
animation: btn-download-progress-in 0.35s cubic-bezier(0.3, 0.7, 0.4, 1.4) 2.5s forwards;
}
.btn-download-progress-input:checked ~ .btn-download-progress-face .btn-download-progress-arrow {
transform-box: fill-box;
animation:
btn-download-progress-bob 0.6s ease-in-out 4,
btn-download-progress-out 0.2s ease-in 2.4s forwards;
}
.btn-download-progress-input:checked ~ .btn-download-progress-face .btn-download-progress-check {
animation: btn-download-progress-draw 0.35s ease-out 2.5s forwards;
}
@keyframes btn-download-progress-fill {
0% { transform: scaleX(0); }
20% { transform: scaleX(0.22); }
38% { transform: scaleX(0.3); }
60% { transform: scaleX(0.66); }
75% { transform: scaleX(0.72); }
92%, 100% { transform: scaleX(1); }
}
@keyframes btn-download-progress-count {
0% { --btn-download-progress-p: 0; }
20% { --btn-download-progress-p: 22; }
38% { --btn-download-progress-p: 30; }
60% { --btn-download-progress-p: 66; }
75% { --btn-download-progress-p: 72; }
92%, 100% { --btn-download-progress-p: 100; }
}
@keyframes btn-download-progress-busy {
0%, 6%, 100% { opacity: 0; }
13%, 90% { opacity: 1; }
}
@keyframes btn-download-progress-out {
to { opacity: 0; transform: translateY(-0.4em); }
}
@keyframes btn-download-progress-in {
from { opacity: 0; transform: translateY(0.5em); }
to { opacity: 1; transform: none; }
}
@keyframes btn-download-progress-bob {
50% { transform: translateY(18%); }
}
@keyframes btn-download-progress-draw {
to { stroke-dashoffset: 0; }
}
@media (prefers-reduced-motion: reduce) {
.btn-download-progress, .btn-download-progress *, .btn-download-progress::before, .btn-download-progress::after, .btn-download-progress *::before, .btn-download-progress *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--btn-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--btn-size. Every other dimension is inem, so the whole thing scales together. Currently previewing18px. - Speed: change the duration on the
transitionoranimationshorthand. Staggered delays are relative, so they keep their rhythm. - Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.